Recent questions tagged Performance

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performance - Simulate low bandwidth in android

Does anyone know a possibility to simulate a low bandwidth on Android phones (i.e. EDGE or G3) while ... for something to simulate it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Why is subtraction faster than addition in Python?

I was optimising some Python code, and tried the following experiment: import time start = time.clock() x ... general programming lesson here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - MySql - slow sending data phase

One of my queries on MySQL 5.0.45 is running slow in "sending data" phase. The query is a ... 241461,242012#msg-242012 Can somebody validate? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Full-text search in Postgres or CouchDB?

I took geonames.org and imported all their data of German cities with all districts. If I enter "Hamburg", it ... regularly, it's rather static! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Node.js slower than Apache

I am comparing performance of Node.js (0.5.1-pre) vs Apache (2.2.17) for a very simple scenario - ... works fine with no connections dropped. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Possible shortcomings for using JIT with R?

I recently discovered that one can use JIT (just in time) compilation with R using the compiler package (I ... will be of great help? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - R: Why is the [[ ]] approach for subsetting a list faster than using $?

I've been working on a few projects that have required me to do a lot of list subsetting and while profiling ... depend on some other factors? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Java check if boolean is null

How do you check if a boolean is null or not? So if I know "hideInNav" is null. How do I stop it from ... hideInNav != null ? hideInNav : ""; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Saving a Dictionary<String, Int32> in C# - Serialization?

I am writing a C# application that needs to read about 130,000 (String, Int32) pairs at startup to a ... each line, thus improving performance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - WPF: what's the most efficient/fast way of adding items to a ListView?

I need to display lots of rows in a grid added at a pretty high frequency (up to 10 rows per second in ... thanks to Akash for this great idea. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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839 views

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performance - Laziness and tail recursion in Haskell, why is this crashing?

I have this fairly simple function to compute the mean of elements of a big list, using two accumulators to ... still get a stack overflow. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - In what cases should I use memcpy over standard operators in C++?

When can I get better performance using memcpy or how do I benefit from using it? For example: float a[3]; float b[3]; is ... b[1]; a[2] = b[2]; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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858 views

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performance - Math.floor VS Math.trunc JavaScript

Background I am making a function that receives a positive number and then rounds the number to the closest integer ... Which one should I use? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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743 views

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performance - Why Is HTTP/SOAP considered to be "thick"

I've heard some opinions that the SOAP/HTTP web service call stack is "thick" or "heavyweight," but I can't ... anyone shed some light on this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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860 views

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performance - MySQL: Very slow update/insert/delete queries hanging on "query end" step

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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performance - Why are interface projections much slower than constructor projections and entity projections in Spring Data JPA with Hibernate?

I've been wondering which kind of projections should I use, so I did a little test, which covered 5 types ... everything you need to know. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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966 views

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performance - Why is std::pair faster than std::tuple

Here is the code for testing. Tuple test: using namespace std; int main(){ vector<tuple<int,int>> v; for (int var ... 4.8.3-7) GLIBCXX_3.4.19 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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809 views

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performance - Android Battery usage profiling

Is there any way to profile the battery usage by the application in development environment or real time? ... providing any per application API See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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707 views

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performance - When are VBOs faster than "simple" OpenGL primitives (glBegin())?

After many years of hearing about Vertex Buffer Objects (VBOs), I finally decided to experiment with them (my stuff ... VBOs? What am I missing? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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809 views

1 answer

performance - What's the fastest way to iterate over an object's properties in Javascript?

I know that I can iterate over an object's properties like this: for (property in object) { // do stuff } ... with enumerability - I'm not. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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836 views

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performance - Getting ETags right

I've been reading a book and I have a particular question about the ETag chapter. The author says that ETags might ... an MD5 hash as an ETag. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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870 views

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performance - JMeter understanding ramp-up

This is the configuration of my test plan thread properties: Number of Threads (users): 100 Ramp-up Period (in ... if Loop Count affects this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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728 views

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performance - algorithms: how do divide-and-conquer and time complexity O(nlogn) relate?

In my Algorithms and Data Structures class a first divide-and-conquer algorithm namely merge sort was introduced. ... computed? Cheers, Andrew See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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868 views

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performance - How to speed up grails test execution

While developing a Grails 1.0.5 app I'm appalled at how slow the grails test-app command is. Even ... execution would be greatly appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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736 views

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performance - Fastest Way To Read and Write Large Files Line By Line in Java

I have been searching a lot for the fastest way to read and write again a large files (0.5 - 1 GB) ... more time. Any suggestions please? Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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653 views

1 answer

performance - Why is Julia taking a long time on the first call into my module?

Essentially the situation I have is this. I have a module (which also imports a number of other modules). I have ... I figure out what that is? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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831 views

1 answer

performance - How to speed up Android Studio compilation process

Latest update: Check out Android Studio 2.0 (preview) Instant Run it is awesome!!!! I have found some ... /11/android-studio-20-preview.html See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

1 answer

performance - Ways to improve WPF UI rendering speed

In case a screen of a WPF application contains lots of primitive controls, its rendering becomes sluggish. What are ... or something like that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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